| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
12.5%
|
|
| 1994 | 1 |
12.5%
|
|
| 1997 | 1 |
12.5%
|
|
| 1998 | 1 |
12.5%
|
|
| 2001 | 2 |
25%
|
|
| 2002 | 1 |
12.5%
|
|
| 2003 | 1 |
12.5%
|
|
| Sysmiss | 1789 |